The evils of exchanging scions
Well, here it is, after an unusually cool Spring, I got to discover how some of the scions I've obtained through exchanges have apple mosaic virus and have infected some of my trees. What surprised me is that the virus showed up from various different sources, which makes me wonder how prevalent infected wood is.
So far, only GRIN wood and Maple Valley orchard wood has proven to be virus free. Fedco trees, CRFG exchanges and Botner all appear to be sources of infected wood. CRFG is by far the worst offender, which makes me seriously question if I would consider grafting wood from CRFG exchanges without knowing where it came from.
It's really worth paying a little extra to get clean wood.